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第 15 章 传感器在工程检测中的应用 15.1 温度测量 15.2 压力测量 15.3 流量测量 15.4 物位测量. 15.1 温度测量. 15.1.1 温度概述 1. 温度与温标 - PowerPoint PPT Presentation
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15
15.1 15.2 15.3 15.4
15.1 15.1.1 1. () TK
19271990ITS90IPTS68 1 K1/273.16 T90t90T90t90 t90/= T90 /K-273.16
2. (1) 15 -1 15 1
(2)
15.1.2 , 1. 15-2
15 2 (a) (b)
15 3 (a) (b)
15 4
2. 15 - 5 -80600
15 5
3. 15-6 20m60m
15 6
15.1.3 1. (15-7 )TT0, AB ;
15 7
15 8
eAB(T)eABT0
, NAtNBtAB
15-7 eAB(T,T0)=eAB(T)-eAB(T0) T0eAB(T0)=cT eAB(T,T0)=eAB(T)-c=f(T) eABT T0T
2. :
15-915-9a eABC(t,t0)=eAB(t)+eBC(t0)+eCA(t0) t=t0 eBC(t0)+eCA(t0)=-eAB(t0) 15-1015-9 eABC(t,t0)+eAB(t0)-eAB(t0)=eAB(t,t0)
15-9
tcABtt0eAB(t, t0)ABttctct0eAB(t, tc)eAB(tc, t0)15-10 eAB(t,t0)=eAB(t,tc)+eAB(tc,t0) , , 0AB(15-10)
15-10
3. IEC8IEC
4. (1) 15-11
15-11
(2) 15-12
15-12
(3) 15-13 0.010.1m
15-13
5. 00 teAB(t, 0)eAB(t,t0) eAB(t,0)= eAB(t,t0)+eAB(t00) eAB(t00)t0
(1) , t0 3502000mm 0100
(2) t00eABtt0teAB(t,0)eAB(t,t0) eAB(t,0)= eAB(t,t0)+eAB(t00)
(3) 0 00
(4) Uab0 15-14r1r2r3rcueAB(t,t0)rcu Uabt0
15-14
6. 15-15 15-16
15-15 (b) (c) (d)
15-16
15-17
15-17 (a) (b) (c)
15.1.4 -2008501K100015-18
15-18
1. R-t (1) IEC-200850 -2000 Rt=R01+At+Bt2+Ct3(t-100)
0850 Rt = R0(1+At+Bt2) RtR0t0 ABC ITS90 A=3.908310-13/ B=-5.77510-7/2 C=-4.18310-12/4
t0R0R0=10R0=100Pt10Pt100Pt100 Rt-tRt Pt10015-8
W100 R100100 R00 W100IECW1001.3850W100=1.3930 99.9995%
(2) -50150 Rt=R01+t,=4.2810-3/ Cu50(R0=50)Cu100R100=100
2. 15-19
1 mm 15-20
15-20
15.1.5 PNPN PN150
1. 15-21 V1V2I1I2V1V2V1V2Ube
15-21
2. (1) 15-22 I1R1I1=I2 1 R1=940R2=30 k=37
15-22
2 15-23 V1V2 V3V4V3V48=8IT R
15-23
R358 ADAD590SG59015-23AD590430 V -50150
3. AD590 AD590 AD590 (1) 15-24AD59025298.2K298.2AAD590Uo1 mV/K25Uo298.2 mVUoAD590
15-24
(2) 15-25 AD311RTAD581 AD590
15-25
(3) 15-26 AD590AD580 2.5 VR2, I1=t010-3 (mA) R1t0U1=I1R1
15-26
t0eAB(t00)St0SV/U1eAB(t00)R1R1 15350.5
15.2 : P F A
SI111Pa kgf/cm2 mmHg mmH2Oatm 1kgf/cm2=0.9807105 Pa1 mmH2O=0.980710 Pa1 mmHg=1.333102 Pa1 atm=1.013 25105 Pa
(1) P (2) P0 (3) p (4)
15-27 U
p=p2-p1=gh, U p1P0p2 p2=gh
U15-28UpP0 p=gh
15-28 (a) Ub ; c
15.2.3 1. 15-29
15-29
15-30p xp : c A
15-30
cAx
2. 15-31 pBB15-31/p
15-31
a=b=0 15-329 12354678
15-32
3. 15-33
15-33 (a) (b)
4. 1 3/42/31/3
24105 Pa104 Pa Y-100(06)105Pa2105 Pa4105 Pa1/32/3 104 Pa 1.5
2 15-34a
15-34 (a) (b)
15-34b 15-35
15-35
15.3 15.3.1
1 qv m3/s vAdA qv=vA
2 qm kg/s qm=qv=vA
101% 103%10kPa3% 20101 325 PaqVNNm3/s
: :
15.3.2 15-36
15-36
1. 15-37
15-37 (a) (b) (c)
2. 1 p(p=p1-p2)
15-38AA0 A0A
15-38
2 -v10p101-v20p202- 1=2=
C1C2 C1=v10/v1, C2=v20/v2 v1v2
A1v1=A2v2 mm=A0/A1, A1- =A2/A0A2-
p1p2 p=p1-p2
121=11
3. 15-39
p p
15.3.3 15-40
15-40
qvv K
BDKExqvExqv 50Hz 90
010 mA 420 mA
15.3.4 15-41
15-41
rc15 - 42 vuv u= rc=v tan n
A zfnzHz ,
0.1
15-42
15.3.5
15-43 hlh/l=0.281fvd , St
15-43
St500150 000 15-44St=0.20St=0.16 fvdv qv
15-44
15-4515-43
15-45
15-46
15-46
15.3.6 ,
: :
1. mP15-47 : ar 2r P : at, 2varat2vm-2vm
15-47
vxFc Fc=2vAx , A qm=vA Fc=2qmx
15-48U U
15-48
2. 1 q2v
2 qv K1qvK2=Kqm
3 pq2vqv
15.4 15.4.1
(1) (2) (3)
(4) (5) (6) (7)
15.4.2 1. 15-49
15-49
15-50 15-51 4
15-50
15-51
2. 15-52Am mg=Cx0
C x0 H h xH=h+x mg-Ahg=C(x0-x) ,
15-52
Ahg=Cx xH
15.4.3 15-53
15-53
Hm kg/m3 gm/s2 pPa 15-54
15-54
p0 p+=gH+p0 p-=p0 p=p+-p-=gH Hp p-